SCANNED USGS TOPOGRAPHIC QUADS
Status: Obtained in 1996, Data completed in December 1995
SOURCE/CONVERSION METHODOLOGY
This data layer is obtained from MassGIS at the Executive Office of Environmental Affairs (EOEA). According to MassGIS Data layer description,
"MassGIS scanned the USGS 7.5 minute series topographic quadrangles to create a digital database that can provide images of the paper maps. These images can be used as a backdrop for plotting vector data, and for interpretation and analysis. The images are indexed by the Digital Orthophoto Quad (DOQ) Index." There are 5 quads covering Brookline area. The image name is an index sheet-id composed of the first three digits of the x and y NAD83 state plane coordinates of the image’s lower right corner, prefixed by the letter ‘Q’.
"The paper maps were converted to image by scanning. Unfolded USGS quadrangles were used if available. The maps were scanned with a Tangent CC500-50TF drum scanner at 250 dots per inch (dpi) into 8 bit compressed TIFF images. Each scanned quad was registered to MA State Plane NAD27 in ARC/INFO with REGISTER. After registration, the images were converted to grids in ARC/INFO GRID module where they were projected into NAD83 MA State Plane meters. Afterwards, the grid was clipped by a DOQ template and each clipped grid was converted back into TIFF image"
IMAGE NAMES
Q233898.TIF, Q233894.TIF, Q233890.TIF, Q229898.TIF, Q229894.TIF
IMAGE CATALOG
Image catalog name: USGSQUAD
FEATURE TYPE
IMAGE (TIFF image)
ATTRIBUTES
There are no attributes for the images.
COORDINATE SYSTEM
Massachusetts State Plane Coordinates NAD 83 meters.